EV doesn't give a minimum rating. THe zx1's are 200 rms, 800 peak. The subs are 400w rms, 1600 peak. My power amps produce 320 @ 8 ohms and 660w @ 4 ohms. This is a maximum output. I used to use a Yamaha EMX 512 that worked nicely at 500w per side. The load is 4 ohms for each stack. Rule of thumb for power is twice the rms of your speakers. A powered mixer or amp should produce a minimum of 300w per channel @8 ohms. I would go with 400w per side or above- you'll have more headroom.